Dual-strategy of hetero-engineering and cation doping to boost energy-saving hydrogen production via hydrazine-assisted seawater electrolysis

When compared with pure water, hydrogen produced by seawater electrolysis has a better practical application potential. By replacing the oxygen evolution reaction (OER) and competitive chlorine (ClER) thermodynamically favorable anodic hydrazine oxidation (HzOR) in alkaline seawater, energy-saving production can be achieved. In this study, Fe/Co dual-doped Ni2P MIL-FeCoNi heterostructures (FeCo-Ni2P@MIL-FeCoNi) arrays simultaneous cation doping hetero-engineering provide excellent bifunctional electrocatalytic performance for HzOR (HER) electrolyte. Overall splitting (OHzS) is impressive, low cell voltage of only 400 mV required to reach 1000 mA cm−2 stable operation h maintain above 500 cm−2. As proof-of-concept, OHzS system save 3.03 kW when producing 1.0 L H2 N2H4-free system, resulting production. Density functional theory calculations show that combination Co-doping fabrication FeCo-Ni2P heterointerfaces result water dissociation barrier, optimized adsorption free energy toward HER, adsorbed dehydrogenation kinetics HzOR. This processing route paves way approach efficient utilization hydrogen, which abundant ocean field, achieve carbon-neutral economy.